CN111465068A - Communication method for power line carrier and wireless dual-mode fusion - Google Patents
Communication method for power line carrier and wireless dual-mode fusion Download PDFInfo
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- CN111465068A CN111465068A CN202010192111.2A CN202010192111A CN111465068A CN 111465068 A CN111465068 A CN 111465068A CN 202010192111 A CN202010192111 A CN 202010192111A CN 111465068 A CN111465068 A CN 111465068A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/14—Reselecting a network or an air interface
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/24—Connectivity information management, e.g. connectivity discovery or connectivity update
- H04W40/246—Connectivity information discovery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a communication method for integrating a power line carrier and a wireless dual mode, which adopts a communication protocol of a four-layer architecture during communication and comprises the following steps: s1, after generating communication service, the physical layer carries out diversity processing and output to the input signals of the power carrier communication channel and the wireless communication channel based on OFDM modulation technology; s2, after receiving the data sending task, the MAC layer selects a power line carrier communication channel or a wireless communication channel to send data; s3, the network layer selects the optimal routing table path containing the power line carrier communication channel and the wireless communication channel; and S4, the application layer collects data of the power carrier communication channel and the wireless communication channel. The dual-mode converged communication method of the power line carrier communication and wireless communication technology provided by the invention has the advantages of the two technologies, realizes heterogeneous converged network communication of the power line and the wireless, optimizes network performance, improves acquisition success rate, and reduces construction and use cost of the smart grid.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a communication method for integrating power line carrier and wireless dual modes.
Background
The Power line L ine Carrier (P L C) and wireless are two main communication modes in the construction and application process of a smart grid, the Power line is generally distributed in a wall, the line is relatively safe and is not easy to damage, but the communication quality of the Power line Carrier generally has certain fluctuation due to the factors of line noise interference, time-varying input impedance, signal attenuation and the like.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a communication method for integrating a power line carrier and a wireless dual mode.
The invention provides a communication method for integrating power line carrier and wireless dual modes, which adopts a communication protocol of a four-layer architecture when in communication, wherein the data flow direction of an information receiving end comprises a physical layer, an MAC layer, a network layer and an application layer, and the data flow direction of an information sending end comprises the application layer, the network layer, the MAC layer and the physical layer, and comprises the following steps: s1, after generating communication service, the physical layer carries out diversity processing and output to the input signals of the power carrier communication channel and the wireless communication channel based on OFDM modulation technology; s2, after receiving the data sending task, the MAC layer selects a power line carrier communication channel or a wireless communication channel to send data; s3, the network layer selects the optimal routing table path containing the power line carrier communication channel and the wireless communication channel; and S4, the application layer collects data of the power carrier communication channel and the wireless communication channel.
Preferably, the step S1 includes: the input signal is modulated by OFDM modulation technique, and then is sent out through power carrier communication channel and wireless communication channel, and is adjusted by OFDM modulation technique after diversity combination is carried out at signal receiving end.
Preferably, the step S2 includes: after receiving the sending task, the MAC layer monitors the power line carrier communication channel or the wireless communication channel at the same time, and if the monitoring result shows that the power line carrier communication channel and the wireless communication channel are not idle, the MAC layer continues to monitor the power line carrier communication channel and the wireless communication channel; if the monitoring result is that the power line carrier communication channel is in an idle state, transmitting data through the power line carrier communication channel; and if the monitoring result is that the wireless communication channel is in an idle state, transmitting the data through the wireless communication channel.
Preferably, after receiving the sending task, the MAC layer uses a corresponding power carrier communication channel or wireless communication channel according to the data sending time and the current TDMA time slot; if the data transmission time corresponds to the TDMA time slot of the current power carrier communication channel, the power carrier communication channel is adopted for data transmission; otherwise, the wireless communication channel is adopted for data transmission; if the TDMA time slot of the power carrier communication channel or the TDMA time slot of the wireless communication channel is designated in the transmission task, the MAC layer needs to wait for the corresponding TDMA time slot and then start transmission.
Preferably, step S3 includes the network layer selecting the optimal routing table path according to the communication success rate, the communication level and the communication delay.
Preferably, step S4 includes that the data transmitted by the power line carrier communication channel includes data of a meter reading service, and the data transmitted by the wireless communication channel includes data of a water meter reading service, a gas meter reading service, and a heat meter reading service.
The beneficial effects of the invention include: the dual-mode converged communication method of the power line carrier communication and wireless communication technology provided by the invention has the advantages of the two technologies, realizes heterogeneous converged network communication of the power line and the wireless, optimizes network performance, improves acquisition success rate, and reduces construction and use cost of the smart grid.
Drawings
Fig. 1 is an overview of a communication method of power line carrier and wireless dual mode convergence according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a complete power line carrier and wireless dual-mode converged communication flow under a smart grid layered communication protocol architecture according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of physical layer fusion of power line carrier and wireless OFDM signal spatial diversity according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of MAC layer fusion in a unified CSMA manner of power line carrier and wireless according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of MAC layer fusion in a unified TDMA scheme of power line carrier and wireless according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of network layer convergence of preferred paths of power line carriers and wireless according to an embodiment of the present invention.
Fig. 7 is a schematic diagram of application layer convergence of a power line carrier and a wireless multiple application service according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. It should be emphasized that the following description is merely exemplary in nature and is not intended to limit the scope of the invention or its application.
Non-limiting and non-exclusive embodiments will be described with reference to the following figures, wherein like reference numerals refer to like parts, unless otherwise specified.
The integrated power line carrier and wireless dual-mode integrated communication process under the layered communication protocol of the smart grid is shown in fig. 2, wherein an integrated communication process is initiated by an application program at a transmitting end, and information is transmitted to an application layer at a receiving end through communication protocols at all layers. The data flow order of the originating end is: the dual-mode converged application layer, network layer, MAC layer and physical layer, and the data flow sequence of the receiving end is as follows: a physical layer, a MAC layer, a network layer and an application of dual-mode fusion. The dual-mode converged physical layer provides physical medium connection and a path for transmitting data for communication of the smart grid, and the physical medium connection and the path comprise wired media and wireless media, and continuously interconvert transmitted '0' and '1' bit streams and physical signals. The MAC layer of the dual-mode fusion is mainly responsible for framing and unframing the bit streams of 0 and 1 of the physical layer and provides an access method for a shared dual-mode medium. The purpose of the network layer with dual-mode convergence is to realize transparent data transmission of the end-to-end in the communication system, and generally, the service of the network layer with dual-mode convergence is realized through specific functions such as addressing, routing, path maintenance and the like. The application layer of the dual-mode convergence provides an interface between an application service program and the underlying network layer of message transmission, and is a starting point and an end point of a complete dual-mode convergence communication process. The invention introduces a method for dual-mode fusion of a power line carrier communication channel and a wireless communication channel according to the sequence from a physical layer, an MAC layer, a network layer to an application layer.
The communication method for integrating the power line carrier and the wireless dual mode comprises the following steps: and S1, after the communication service is generated, the physical layer processes and outputs the input signals of the power carrier communication channel and the wireless communication channel based on the OFDM modulation technology. S2, after receiving the data sending task, the MAC layer sends the data through a power line carrier communication channel or a wireless communication channel; s3, the network layer selects the optimal routing table path containing the power line carrier communication channel and the wireless communication channel; and S4, the application layer collects data of the power carrier communication channel and the wireless communication channel. The above steps are described in detail as follows.
At present, power line carrier communication in a smart grid adopts a physical layer modulation signal technology based on OFDM (Orthogonal frequency division Multiplexing), and meanwhile, various wireless communication technologies based on OFDM, such as WIFI, 4G and the like, also exist. When the wireless part of the smart grid adopts the same OFDM modulation technology as the power line carrier communication channel, the physical layer fusion method of OFDM signal space diversity as shown in FIG. 3 can be adopted to realize the dual-mode fusion of the power line carrier communication channel and the wireless communication channel. After being modulated by OFDM, the input signals are respectively sent out through a wireless communication channel and a power line carrier communication channel, at the moment, the signals sent out on the wireless communication channel and the power line carrier communication channel are consistent, namely, the output signals of a transmitting end are equivalent to diversity duplication on two different spaces of the wireless communication channel and the power line carrier communication channel. Correspondingly, the receiver needs to perform diversity combination of signals after receiving the signals in the wireless communication channel and the power line carrier communication channel, and the combined signals are subjected to OFDM demodulation to obtain output information.
The access modes of the MAC layer related in the smart grid are two types: CSMA (Carrier Sense Multiple Access) and TDMA (Time Division Multiple Access). Therefore, there are two MAC layer dual-mode fusion methods for the corresponding wireless communication channel and power line carrier communication channel: a unified CSMA fusion mode and a unified TDMA fusion mode.
Fig. 4 is a schematic diagram illustrating power line carrier and wireless unified CSMA MAC layer fusion according to an embodiment of the present invention. After receiving the sending task, the MAC layer can monitor the carrier waves in two channels, namely a wireless communication channel and a power line carrier communication channel, and if the wireless communication channel and the power line carrier communication channel are not idle, the monitoring is continuously carried out in the two channels. If the power line carrier communication channel detects that the channel is idle, data transmission is performed on the power line carrier communication channel. If the wireless communication channel detects that the channel is clear, data is transmitted over the wireless communication channel.
Fig. 5 is a schematic diagram illustrating MAC layer fusion in a unified TDMA scheme between power line carrier and wireless according to an embodiment of the present invention. The time slots within one TDMA cycle of the MAC layer are uniformly divided into two chunks: a TDMA time slot for a power line carrier communication channel and a TDMA time slot for a wireless communication channel. After receiving the sending task, the MAC layer may use a corresponding channel to send according to the sending time and the current TDMA timeslot division. And if the sending time corresponds to the current TDMA time slot of the power line carrier communication channel, the power line carrier communication channel is adopted for sending. If the transmission time corresponds to the current TDMA time slot of the wireless communication channel, the wireless communication channel is adopted for transmission. If the MAC layer is appointed to transmit by using the power line carrier communication channel in the transmission task, the MAC layer needs to wait for the TDMA time slot of the power line carrier communication channel to start transmission. Similarly, if the MAC layer is designated in the transmission task to transmit using the wireless communication channel, the MAC layer needs to wait until the TDMA time slot of the wireless communication channel to restart transmission.
Fig. 6 is a schematic diagram illustrating network layer convergence of power line carriers and wireless preferred paths according to an embodiment of the present invention. The smart grid in the embodiment of the invention simultaneously performs networking on the power line carrier communication channels or the wireless communication channels, and in the process of forming the routing table, the network layer does not intentionally distinguish the power line carrier communication channels or the wireless communication channels, but performs optimization on the routing table paths according to indexes such as communication success rate, communication level, communication delay and the like, so that the optimized paths finally recorded in the routing table may be all paths which fall on the power line carrier communication channels, for example, node1 passes through the power line to node2, and then passes through the power line carrier communication channels to node 5; it is also possible that all paths fall on a wireless communication channel, for example node6 passing through wireless to node3, through wireless to node 1; more likely, the hybrid paths are distributed in two channels, namely a power line carrier communication channel and a wireless communication channel, for example, node1 is sent to node2 through a power line, and then is sent to node4 through wireless; and node4 goes over the power line to node3 and then over the wireless to node 1.
Fig. 7 is a schematic diagram illustrating application layer convergence of a power line carrier and a wireless multiple application service according to an embodiment of the present invention. The application layer of the embodiment of the invention has an application of four-meter centralized reading, and comprises four application service business items of electric meter centralized reading, water meter centralized reading, gas meter centralized reading and thermal meter centralized reading. The electric meter centralized reading service can be completed through a power line carrier communication channel, and the water meter, the gas meter and the heat meter cannot be electrified, so that the electric meter centralized reading service must be completed through a wireless communication channel. Therefore, in order to implement the four-table centralized reading application, the four application service items need to be respectively completed on the power line carrier communication channel and the wireless communication channel, and finally, data obtained from different channels are collected to the application layer, so that application layer data fusion of the power line carrier communication channel or the wireless communication channel is completed.
The communication method for the integration of the power line carrier and the wireless dual mode provided by the invention completes the integration communication of the power line carrier and the wireless dual mode from different layers of a physical layer, an MAC layer, a network layer and an application layer from the perspective of a general communication protocol architecture. In this way, during the implementation, the most suitable dual-mode fusion method can be determined by comprehensively considering factors such as a wireless communication mode, communication protocol content, communication environment, application service content and the like. Therefore, heterogeneous converged network communication between the power line and the wireless network is realized, network performance is optimized, acquisition success rate is improved, and construction cost of the smart grid is reduced.
Those skilled in the art will recognize that numerous variations are possible in light of the above description, and therefore the examples and drawings are merely intended to describe one or more specific embodiments.
While there has been described and illustrated what are considered to be example embodiments of the present invention, it will be understood by those skilled in the art that various changes and substitutions may be made therein without departing from the spirit of the invention. In addition, many modifications may be made to adapt a particular situation to the teachings of the present invention without departing from the central concept described herein. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments and equivalents falling within the scope of the invention.
Claims (6)
1. A communication method for integrating power line carrier and wireless dual modes is characterized in that when the communication method is used for communication, a communication protocol of a four-layer architecture is adopted, the data flow direction of an information receiving end is a physical layer, an MAC layer, a network layer and an application layer, and the data flow direction of an information sending end is the application layer, the network layer, the MAC layer and the physical layer, and the communication method comprises the following steps:
s1, after generating communication service, the physical layer carries out diversity processing and output to the input signals of the power carrier communication channel and the wireless communication channel based on OFDM modulation technology;
s2, after receiving the data sending task, the MAC layer selects a power line carrier communication channel or a wireless communication channel to send data;
s3, the network layer selects the optimal routing table path containing the power line carrier communication channel and the wireless communication channel;
and S4, the application layer collects data of the power carrier communication channel and the wireless communication channel.
2. The communication method of the power line carrier and wireless dual mode convergence according to claim 1, wherein the step S1 includes: the input signal is modulated by OFDM modulation technique, and then is sent out through power line carrier communication channel and wireless communication channel, and is adjusted by OFDM modulation technique after diversity combination is carried out at signal receiving end.
3. The communication method of the power line carrier and wireless dual mode convergence according to claim 1, wherein the step S2 includes: after receiving the sending task, the MAC layer monitors the power line carrier communication channel or the wireless communication channel at the same time, and if the monitoring result shows that the power line carrier communication channel and the wireless communication channel are not idle, the MAC layer continues to monitor the power line carrier communication channel and the wireless communication channel; if the monitoring result is that the power line carrier communication channel is in an idle state, transmitting data through the power line carrier communication channel; and if the monitoring result is that the wireless communication channel is in an idle state, transmitting the data through the wireless communication channel.
4. The communication method of the integration of the power line carrier and the wireless dual mode as claimed in claim 1, wherein after receiving the transmission task, the MAC layer adopts the corresponding power line carrier communication channel or the wireless communication channel according to the data transmission time and the current TDMA time slot; if the data sending time corresponds to the TDMA time slot of the current power line carrier communication channel, the power line carrier communication channel is adopted for data sending; otherwise, the wireless communication channel is adopted for data transmission; if the TDMA time slot of the power line carrier communication channel or the TDMA time slot of the wireless communication channel is designated in the transmission task, the MAC layer needs to wait for the corresponding TDMA time slot and then start transmission.
5. The communication method of the integration of the power line carrier and the wireless dual mode as claimed in claim 1, wherein the step S3 includes the network layer selecting the optimal routing table path according to the communication success rate, the communication level and the communication delay.
6. The communication method of the integration of the power line carrier and the wireless dual mode as claimed in claim 1, wherein the step S4 includes that the data transmitted by the power line carrier communication channel includes data of a meter reading service, and the data transmitted by the wireless communication channel includes data of a water meter reading service, a gas meter reading service and a heat meter reading service.
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| CN114143250A (en) * | 2021-12-02 | 2022-03-04 | 苏州卓智创芯电子科技有限公司 | Heterogeneous network system construction method based on converged communication system and meter reading method thereof |
| CN114285436A (en) * | 2021-12-19 | 2022-04-05 | 广东电力通信科技有限公司 | Dual-mode communication method and system for wireless fusion of power line carrier and 230 and 433 |
| CN114285436B (en) * | 2021-12-19 | 2023-08-22 | 广东电力通信科技有限公司 | Dual-mode communication method and system for wireless fusion of power carrier and 230M and 433M |
| CN114374721A (en) * | 2022-01-14 | 2022-04-19 | 重庆大学 | Power line and wireless communication fusion method and system for power internet of things |
| CN115065635A (en) * | 2022-07-27 | 2022-09-16 | 北京智芯微电子科技有限公司 | Dual-mode communication method, module and system |
| CN115189719A (en) * | 2022-09-09 | 2022-10-14 | 北京智芯微电子科技有限公司 | Data transmission method, data transmission system, and computer-readable storage medium |
| CN116743652A (en) * | 2023-07-31 | 2023-09-12 | 联桥科技有限公司 | Dual-mode communication method and system for power carrier and wireless fusion |
| CN116743652B (en) * | 2023-07-31 | 2024-04-12 | 联桥科技有限公司 | Dual-mode communication method and system for power carrier and wireless fusion |
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